【作者】 邢强；

【导师】 宋春晖；

【作者基本信息】 兰州大学 ， 古生物学与地层学， 2008， 硕士

【摘要】 准噶尔盆地西北缘红山嘴地区是一个勘探历史比较久的地区,前人对该区基础石油地质工作的前期研究不足,储层地质学方面还存在一些问题,储层岩石学特征、孔隙结构特征及物性特征研究不足;此外,对成岩作用类型、成岩阶段及成岩序列的研究不够系统,控制储层物性的因素尚不明确;本文就这一地区存在的问题,以沉积学和储层地质学理论为指导,利用薄片鉴定、压汞等其他室内分析化验资料,结合野外露头观察、岩芯观察及钻测井资料,深入研究了红山嘴地区中生代储层的沉积相、储层岩石学、成岩作用、储层物性特征及物性控制因素,并指出有利的勘探目标区。利用野外露头资料、钻井岩芯资料和薄片鉴定、扫描电镜等分析测试手段进行了储层岩石学特征及成岩作用的研究。研究区内岩石的结构成熟度和成份成熟度都较低,以岩屑砂岩和长石岩屑砂岩为主。成岩作用类型主要有压实作用、胶结作用、溶解作用和交代作用,其中压实作用和碳酸盐的胶结作用是工区内储层物性变差的主要原因。该区典型的成岩序列为早期方解石胶结物沉淀→机械压实作用→方解石胶结物胶结、交代作用→碳酸盐胶结物和长石碎屑颗粒的溶蚀作用→自生高岭石的沉淀→晚期少量白云石矿物的充填(以齐古组为例)。成岩阶段的划分表明研究区三叠系克下组、克上组及侏罗系八道湾组、齐古组储集砂岩通常处于晚成岩阶段A期,少部分侏罗系砂岩(特别是齐古组)处于早成岩B期。结合孔隙度和渗透率及压汞等资料,对工区内物性特征和孔隙结构特征进行了研究,并利用适合本区的储层分类评价方案,对工区内的储层进行了分类评价,红山嘴地区中生代储层物性普遍较好,砂岩中原生粒间孔隙和粒间溶孔相当发育,粒内溶孔也很常见,认为该区侏罗系齐古组储层条件最好,以Ⅰ和Ⅱ类储层为主。通过储层特征和成岩作用的系统研究,以有利于储集岩发育的沉积微相相带展布、孔隙度在平面上的分布及研究区已发现的含油区等为评价预测依据,预测出工区内三叠系克下组、克上组,侏罗系八道湾组有利目标区各一个,齐古组有利目标区三个,可作为红山嘴地区下一步勘探部署的重点区块。更多还原

【Abstract】 Hongshanzui area in western Junggar Basin has a long prospective history, but the basically geological work is less and there are still questions in geological reservoir, such as, reservoir lithology features, pore texture and petrophysical property; the type, stage as well as the sequences of the diagenesis is not systemically enough; and the controlling factors of petrophysical property is not rather clear. Under the guidance of sedimentology and reservoir geology theories, taking advantage of slice, mercury injection and others geochemistry data and combining outcrop observation, drilling core and logging resources, this paper deeply researched the sedimentary facies, diagenesis,reservoir characteristics and controlling factors. At the end, it predicts the favorable perspective target areas.By means of outcrop, drilling core, slice, cathodoluminescence, SEM and vitrinite reflectance, reservoir lithology features and diagenesis is researched in detail. In this area, the componential and textural maturity is lower and the lithological types are mostly Arkoses, lithic arkoses and feldspar litharenite.Diagenesis types: compaction, cementation, silty filling, dissolution and metasomatism. The former two functions are the main reasons of decreasing reservoir quality.The diagenetic sequence as follows:mechanic compaction→authigenic chlorite clay rim→the dissolve of felspar→quartz overgrowths-latter calcite cementation→calcite Metasomatism→feldspar overgrowths→Hydrocarbon Emplacement(eg.Qigu Formation). According to the stage of the diagenesis, the sand reservoir in lower and upper Ke Formation in Jurassic and the Ba daowan and Qigu Formation in Cretaceous are at late phrase A. Less Jurassic reservoir is early phase B (especially, the Qigu Formation).Base on research results of fore two items, refer to data of porosity, permeability and mercury penetration and so on. Study on features of physical property and pore texture in the areas, and apply the evaluation scheme of reservoir classification that is adapting for these areas, classify and evaluate the reservoir in the areas. The physical property of Mesozoic’s reservoirs are preferable generally which belong to Hongshanzui areas, the origin intergranular porosity and intergranular corroded hollow develop considerably in sands, intragranular corroded hollow is common too, considering conditions of reservoir are best which are in series of Qigu of Jurassic in the areas, I and II types are main reservoir types.Through studying features of reservoir and diagenism systematically, according to profiting facies belt distribution of sediment microfacies, porosity’s distribution on the plane and discoveried oil area of region of interest which used evaluating and predicting, predicted beneficial target area in series of Kexia and Keshang of Triassic, series of Badaowan of Jurassic each one, and there are three beneficial target areas in series of Qigu, which are major block of exploration disposition in next step.更多还原